Boiler furnace



J. W. ANDREE ET AL B0 ILER FURNACE fir Filed Nov. 19,1923

i I {I ll '1 'i i fl J/ u Mei win/57 Patented Jan. 20, 1925.

UNITED STATES PATENT OFFICE.

JOHN W. ANDREE, OF GLENDALE, AND LEO J. KRAPS, OF LONG BEACH, CALIFORNIA.

BOILER FURNACE.

Application filed. November 19, 1923. Serial No. 675,543.

To all to 7mm it may concern Be it known the we, JOHN W. ANnnrin, a citizen of the United States, and a resident of Glendale, county of Los Angeles, State of California, and Lao J. KRArs, a citizen of the United States, and a resident of Long Beach, county of Los Angeles, State of California, have invented new and useful Improvements in Boiler Furnaces, of which the following is a specification.

This invention has to do with a furnace, and has particular reference to a boiler furnace; it being an object of this invention to provide a simple, effective and practical boiler furnace.

In certain localities gas is available as fuel for boilers, and the like, making it practical to equip boilers with furnaces for burning such fuel. It is desirable for boiler furnaces equipped to burn gas to also be equipped to burn oil or like fuel in addition to or in place of gas.

It is an object of this invention to provide a simple, efficient and effective gas burning furnace suitable for a boiler, or the like.

Another object of this invention is to provide a practical, efficient furnace for burning gas or oil, or both.

Another object of this invention is to provide a simple, effective air control for a furnace of the character above referred to.

The various objects and features of our invention will be best and more fully understood from the following detailed description of a typical preferred form and application of the invention, throughout which description reference is had to the accompanying drawings, in which:

Fig. 1 is a sectional view showing a typical steam boiler equipped with the furnace provided by this invention;

Fig. 2 is an enlarged detailview of the furnace as it is shown in Fig. 1;

Fig. 3 is a plan view of the furnace, taken as indicated by the line 33 on Fig. 2, showing certain of the parts broken away; and

Fig. 4: is an enlarged detail sectional view of one of the-gas burners.

The furnace provided by our present invention is particularly suited for steam boilers, however, it is not to be understood as limited to any specific type, form or make'of boiler. For the purpose offacilitating a full and clear understanding of our invention we will herein describe it as applied to or used in connection with a popular type of steam boiler familiar to those skilled in the art, and in connection with which. our invention has been actually employed to great advantage.

The boiler illustrated in the drawings is of the water tube type, and includes, generally, three steam and water drums 10, 11. and 12, a mud drum 13, and three banks of tubes 14, 15, and 16, connecting drums 10, 1.1, and 12, respectively, with the mud drum 13. The steam spaces of the drums 10, 11, and 12, are connected by steam circulating pipes 17. A super-heater 18 is located between the first and second banks; of tubes and is connected with the steam space of the middle drum 11 by a steam pipe 19. The boiler is mounted in a typical setting which is substantially rectangular in form, and includes, generally, a base 20,,side walls 21, a rear wall 22, a front wall 23, and a top 24:.

The furnace, in accordance with our present invention, is located at the lower forward portion of the boiler and setting between the front Wall 23 of the setting and a back partition 25 extending between the base 20 and the forward side of the mud drum 18. The base of the setting forms what we will term the floor, or bottom of the furnace.

The furnace includes, or is equipped with. one or more liquid fuel burners 26, located at the rear of the furnace, that is, at 01' immediately in front of the back 25. The burners- 26 are spaced above the furnace floor and are preferably faced forward or toward the front of the boiler and are tilted somewhat upwardly. The supply pipes 27 for the burners 26, for instance, fuel pipes and air or steam pipes, extend downwardly from the burners and along the floor of the furnace to the front of the boiler where they are equipped with suitable control valves 28.

The inventionprovides one or more blocks of gas burners at the forward part ofthe furnace. The blocks of gas burners are spaced above the furnace floor and extend inwardly or rearwardly from the front wall 23 of the boiler mounting. The blocks of a burners are preferably inclined slightly so that their rear ends are somewhat lower than their forward ends. The blocks are proportioned and arranged so that they extend to about the middle of the furnace, leaving a substantial space between them and the liquid-fuel burners Each bloclrof burners includes a body 30 ofrefractory material, having a plurality of vertical openings 3i through it. Burner tubes 32 are located below the body 3t) and extend upwardly a short distance into the openings 31. The'burner tubes are preferably formed of metal so that they are comparatively thin, melting it prz ictical to arrange them much closer together than would be possible if they were formct'l of a formed. The rear ends of the blocks of burners are supported by props 35 extending upwardly from the furnace floor. lin addition to this support the body 30 is supported at numerous points by suitable transverse supporting bars 36.

'llhe burner tubes are supplied with gas from suitable distributing arms and are open at their lower ends to receive air. The distributing arms 37 extend horizontally into the burner tubes and are provided with openings 37*" which discharge the gas upwardly in the burner tubes. The distributing arms 37 are formed in groups, each group including four arms 37 arranged as illustrated in Fig. 3 of the drawings. The units of distributing arms are connected with main distributing pipes 39 that extend rearwardly under the burner tubes from the front of the setting. The main distributing pipes 39 may be connected togetherin pairs at their forward ends to be supplied with gas from the supply pipes 40. The forward ends of the main distributing pipes are supportedby a transverse supporting member or beam 41 which also supports or aids in supporting the forward ends of the burner blocks. The supply pipes 40 are provided with suitable control valves 42.

In the space between the liquid fuel burners 26 and the blocks of gas burners W e provide a grate 45 of brick or other suitable material. The grate is located somewhat below the level of the burners 26 and extends to the rear ends of the blocks of gas burners. The grate distributes the air and supplies it to the. liquid fuel burners at the proper velocity.

The front wall of the boiler setting is provided, adjacent the base, with openings o for admitting air to the furnace. The openings it; are located so that they admit he air to the furnace below the blocks of gas burners. if The present invention provides a damper lb operable to direct and control the air entering the ii'urnace through the openings lnirccordancc with the prcfcrrtul form of the invention the dan'uier in the form of a nlate, or a plurality of plates, as cir cums ances ma require. located between the blocks of gas burners and the furnacc floor. The .ampcr is pivm'ially mounted at the rear or inner ends of the blocks of gas burners, or at" the point of connection between the blocks of as burners and the grate in. so that its forward end is movable between the 'l'nruzice floor and a part 45) at the forward ends of the blocks of gas burners. The part if) may. as we have illustrated in the drawings. be in the form of an apron cxiti ling downwardly from the bodies 30 of t hloclcs of burners and supported by the brace or beam 41. lVhen the damper down or has its forward portion lowered to the furnace floor the air entering the furnace throu 'h the openings 46 is all directed to the gas ourizcrs so that it passes upwardly through the burner tubes. lVhcn the damper is in the up position or is raised so that its i'orv-tard portion engages the part l a l of the air entering the openings id is directed to the grate 45 for the burners 26. When the damper is in an int'cru'iediute is. between its raised and position. that low-cred positions. it will divide the air ontcring the furnace and will direct part of it; to the gas burners and part. of it to the grate 45 for the oil burners. In practice we provide the damper 1-8 with an operating mechanism so that it: is convenient to operate or control. The operating mechanism illustrated in the drawings includes an operating handle (it) connected to a lever 1 which is fast on a rotatable shaft (32. second lever 63 is fast on the shaft (32 and is connected with the damper by a link (it. Movement of the handle (it) will cause rota tion of the shaftGQ which, through the lever li and linl; (i l. will cause HHH'tHIOHb of the damper.

It is believed that the furnace will be fully foregoing description, how air from the openings 46 may be di rooted to the gas burners to support coin bustion of gas supplied by the supply pipes 40, or may be directed to the grate 4:5 so that it will support combustion of liquid fuel issuing from the burners 26. It will be apparent that the furnace can be operated'on gas alone. on liquid fuel alone. on both gas and liquid fuel simultaneously, and that it may be changed over from one kind operation of the understood from the it being apparcn.

till

of fuel to the other without shutting down the boiler.

We have found by actual practice thatthe arrangement and construction of the blocks of gas burners is particularly efficient and effective. By constructing, locating and arranging the burner tubes and the gas supply arms therefor in the manner above described the tubes can be arranged close together getting a maximum number in a given space. Further, we have found that by locating the gas burners at the forward portion of the furnace the first or front bank of boiler tubes is not overheated, the gases reach the super-heater at a comparatively high ten'iperatnre, and that the general efiiciency of the boiler is high.

Having described only a typical preferred form of our invention we do not wish to limit ourselves to the specific details hereinabove set forth but wish to reserve to ourselves any changes or variations that may appear to those skilled in the art or fall within the scope of the following claims.

Having described our invention, we claim:

1.. In a furnace of the character (lQSCl'll'iQtl, a liquid fuel burner located at the rear of the furnace, a plurality of gas burners located in the forward portion of the furnace s that there is a substantial space between them and the rear of the furnace to admit air to the liquid fuel burner, and means for directing air admitted to the furnace to the liquid fuel burner or to the gas burners.

2. In a furnace of the character described,

a liquid fuel burner located at the rear of the furnace, a plurality of gas burners loated in the forward portion of the fur ace so that there is a substantial space between them and the rear of the furnace to admit air to the liquid fuel burner, and control means for the air admitted to the furnace whereby it can all be directed to the gas burners or to the liquid fuel burner or can b divided between them.

3. A furnace of the character described including, a bottom, front and rear walls, a liquid fuel burner at the rear wall, a. block of gas burners in the forward portion of the furnace spaced above the bottom, and a damper pivotally mounted at the rear end of the block so that its outer part is movable between the bottom and the front end of the block.

A furnace of the character described including, a bottom, front and rear walls. a liquid fuel burner at the rear wall, a block of gas burners in the forward portion of the furnace spaced above the bot-tom, a damper pivotally mounted at the rear end of the block so that its outer part is movable between the bottom and the front end of the block, and means for operating the damper from thefront of the furnace.

In witness that we claim the foregoing we have hereunto subscribed our names this 6th day of November 1923.

JOHN l/V. ANDREE. LEO J. KRAPS. \Vitness:

IDA L. VVESTLAKE. 

